Support structure



FIG. 1 is a front perspective view showing a support structure according to my design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof:

FIG. 6 is a bottom plan view thereof;

FIG. 7 is one side elevational view thereof; and,

FIG. 8 is another side elevational view thereof.

The broken lines in the drawings illustrate portions of the support structure which form no part of the claimed design. 

CLAIM The ornamental design for a support structure, as shown and described. 